Systems Admin/Engineer (Linux)

aqua it; St. Louis (MO); On-site; USD 120,000 - 180,000; Full time

Job summary

Aqua IT is seeking an experienced System Engineer with Linux expertise to support cloud and on-premise systems for a mission operations team. The role focuses on installation, configuration, administration, and maintenance of mission critical infrastructure across Linux environments.

You will lead system change initiatives, collaborate with government and contractor points of contact, and ensure security compliance through STIG/IAVA audits and documentation updates.

Qualifications

• Requires BS degree and 8+ years of experience or Masters with 6+ years of experience.
• Active TS/SCI clearance with ability to obtain a polygraph post hire.
• Must meet DoD 8570 Certification (Security+ or equivalent).
• Proactive self-starter with strong communication skills.
• Experience with Linux administration and provisioning end users.
• Experience managing and configuring RHEL environments.
• Experience building and maintaining multi-node HPC environments.
• Experience with NGA Networking and reviewing STIG/IAVA scans.

Responsibilities

• Lead system changes and improvements; troubleshoot with government and contractor POCs.
• Ensure system security compliance; author and update SOPs and guides.
• Collaborate with teams to optimize performance and reliability.
• Maintain documentation for operations and security procedures.
• Support ISCP exercises and automation initiatives.

Skills

TS/SCI Clearance

Linux administration

RHEL environments

HPC systems (Slurm & MPI)

Scripting (bash/python)

Security documentation

Cloud and on‑premise support

Education

BS degree in a technical field

Masters degree

Tools

Slurm

MPI

IAVA/STIG remediation

Job description

Overview: We have an opening for an experienced System Engineer with Linux system administration experience to support cloud and on-premise systems with a mission operations team. The team is involved in operation and sustainment of a mission-critical geospatial solution supporting DoW end users. A successful candidate will have experience with installation, configuration, administration, support and maintenance of mission critical cloud and on-premise systems.

Responsibilities: Primary responsibilities will involve taking a leadership role in system changes and improvements; working directly with government and contractor POCs to troubleshoot issues; proactively recommend configuration changes to help improve system performance; regularly work with government and contractor POCs to keep systems security compliant; and author and update operational and security documentation, including troubleshooting guides and SOPs. Other tasks as assigned.

Qualifications:

• Requires BS degree and 8+ years of prior relevant experience or Masters with 6+ years of prior relevant experience; OR additional years of experience in lieu of degree
• Must currently possess an active TS/SCI Clearance with ability to obtain & maintain a Polygraph post hire
• Must meet DOD 8570 Certification (Security+ or equivalent or higher)
• Proactive self-starter demonstrating a positive, willing attitude and excellent oral and written communication skills
• Demonstrated ability to adapt to new technologies and learn quickly
• Organizational Skills: Can plan and prioritize work. Follows tasks to their logical conclusion and makes sure that everything has been done to the right standard. Good attention to detail.
• Communications: Ability to communicate clearly and efficiently to team members and clients, verbally and in writing. Able to present ideas in a variety of ways depending upon audience and context.
• Linux administration experience provisioning end users
• Experience managing and configuring RHEL environments
• Experience building, optimizing, and maintaining multi-node environments that run parallel workloads
• Experience with Linux clusters, specifically Slurm and MPI, to support High-Performance Computing (HPC) systems
• Strong understanding of NGA Networking
• Proficient reviewing STIG/IAVA scans and remediating vulnerabilities
• Experience performing Virtual Machine backups/snapshots
• Experience working with Security to support ISCP exercises
• Experience scripting for administration, configuration, troubleshooting, and automation
• Knowledge of Systems, Architectural, SW Development and SW Sustainment Practices

2026-11-09 Code AQI-000360 Type Full-Time City, State St. Louis OR Washington DC Area , Missouri Country United States